A twelve-year-old girl claimed she had been abducted and sexually assaulted. She recounted what happened in such a flat, unemotional voice that police found it difficult to believe her. Fibers on her clothing would prove she was telling the truth, and help police to find her attacker.

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Two suspects living in the same apartment were linked to a murder by a gun and a pair of bloodstained boots – items that belonged to the one who claimed he'd never even met the victim. Investigators hoped the manufacturing code stamped on six beer bottles would be distinctive enough to prove who was telling the truth, and who was a cold-blooded killer.

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It's usually easy to determine how a criminal entered the crime scene. But in this case, it was far from clear. It looked like the killer vanished into thin air...and perhaps he had.

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Early one morning, a woman went missing on her way to work. A strand of hair in her hairbrush led investigators to unravel the mystery.

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Twenty-four years after the death of a 15-year-old in California, forensic scientists discover enough microscopic evidence to finally bring the killer to justice.

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The media dubbed him the “Last Call Killer” because he targeted men in gay bars who were obviously intoxicated. His MO involved dismembering the bodies and wrapping the parts in plastic bags, which he then carefully washed to remove all incriminating evidence. He eluded capture for almost ten years... and then new technology revealed fingerprints no one knew were there.

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Bruce Miller was shot to death in the office of the business he owned. When a computer expert examined the computers owned by the victim’s wife and by her lover, he found the evidence needed to convict the person responsible for the crime.

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A serial killer in Arlington, Va., leaves the same clues behind at each crime scene.

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A young mother is murdered after years of domestic abuse. There are clues at the scene: bloody footprints and DNA from the victim’s rape kit. But the evidence which will conclusively tie the killer to the crime is on a freshly baked hamburger bun. 

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One warm summer afternoon, the town of Verona, Wisconsin, faced its first triple homicide. To solve the case, investigators had to delve into the world of high rollers and offshore betting. With the help of forensics, they were able to bring down a killer who gambled, and lost.

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